PHYSIOLOGICAL PROPERTIES OF GONADS 161 



normal follicles as b shows a normal-appearing ovum farther 

 along in the series in which the nucleus is distinct and well 

 stained; the ovum is contained within the discus proligerus. 

 Three ova in this graft contain a mitotic figure (polar spindle) . 



Animal 51 G. Male animal, born Feb. 27, '18. Apr. 13, '18, one 

 testis removed and two pieces of ovary from sister grafted subcutane- 

 ously. Aug. 22, killed; the remaining testis was normal, and both 

 ovarian grafts had persisted for the 130 days; both were sectioned. 



Microscopic examination. These two grafts present no features 

 of note that have not been illustrated by the previous grafts, 

 except the presence of ovarian tissue in the midst of a consider- 

 able amount of degeneration in the implanted grafts. Graft 1 

 consists of about 275 sections of ovarian tissue, but this is repre- 

 sented almost entirely by a strip of cortical tissue restricted to 

 one side of the recovered graft. The remainder of the graft is 

 principally oviduct. Within the ovarian tissue, how^ever, there 

 are some nine or ten Graafian follicles that contain ova with well- 

 stained nuclei. Aside from these few normal follicles, there are 

 numerous atretic follicles and considerable masses of interstitial 

 cells. 



In graft no. 2 there is more degeneration than in the previous 

 graft, yet about the same number of normal follicles. Here 

 also the number of atretic follicles is very great. In neither of 

 these grafts is there evidence of ovulation or of corpus luteum 

 formation. 



Animal 51 H. Male, born JFeb. 27, '18. Apr. 13, one testis removed 

 and two pieces of ovary from rat of same age placed subcutaneously. 

 Aug. 22, '18, killed; the remaining testicle was normal and both ovarian 

 grafts had persisted for the 130 days; only one was sectioned. 



Microscopic examination. The principal part of this graft is 

 oviduct. The ovarian tissue is restricted to a very small area 

 to the side of the oviduct. The tissue consists of but thirty-five 

 to forty sections and is of a width that would accommodate 

 about two half-sized follicles. However, within this very small 

 mass of tissue there are three follicles that are practically normal; 

 they contain ova whose nucleus is normal and distinct, but the 



